JP2003114656A - Data line changeover circuit for active matrix type display panel, its switching part driving circuit, its drive control circuit, and active matrix type display panel, and active matrix type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure long-term reliability in an active matrix type display device having constitution in which the number of outputs of a data line driving circuit is reduced by connecting plural lines of data lines to an out put of the data line driving circuit while binding them. SOLUTION: In this display device, two lines of data lines DLs are connected respectively to one line of an output signal line D of a data line driving circuit 3 with switching parts. For example, the switching part of a data line DL1 consists of data line selecting TFTs (thin film transistors) 13-1aα, 13-1aβ and the switching part of a data line DL2 consists of data line selecting TFTs 13-1bα, 13-1bβ. Then, these four data line selecting TFTs 13-1aα to 13-1bβ are alternatively driven in a period when pertinent switching parts are selected.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a TFT (Thin Fil).
m Transistor) type liquid crystal display devices and other active matrix display devices. More specifically, a plurality of data lines to which data signals, which are image signals, are bundled and connected to one output of a data line drive circuit. The present invention relates to an active matrix type display device, an active matrix type display panel used in the display device, a data line switching circuit in the display panel, a switch portion drive circuit thereof, and a drive control circuit thereof.

[0002]

2. Description of the Related Art In recent years, liquid crystal display devices have been used in CRT (Cathod).
Since it can be thinner than e Ray Tube) and consumes less power, it is used not only for display devices for portable electronic devices but also for display devices for stationary electronic devices such as personal computers. is there. Above all, an active matrix type liquid crystal display device in which a switching element is provided in each pixel to drive a liquid crystal has been attracting attention because it has a high contrast in principle and a high response speed.

A non-linear resistance element or a semiconductor element is used as the switching element provided for each pixel, but it is possible to realize a transmissive display and easily realize a large area. A TFT formed on a transparent insulating substrate is preferably used.

Further, conventionally, in such an active matrix type liquid crystal display device, a switch unit is provided for each data line on the signal input side of the data line to which the data signal is applied, and the data line is connected via the switch unit. By bundling a plurality of them into one set and connecting them to one output of the data line drive circuit, and selectively driving each switch section, the data signal output from the data line drive circuit is sent to each data line forming the set. Sorting is done.

This is to reduce the number of outputs of the data line drive circuit. By simply calculating and bundling two data lines as one set, the number of output signal lines of the data line drive circuit is 1 for the data line and the output signal line of the data line drive circuit.
It is half of the configuration of connecting one to one, and it is 1 when bundling 3
/ 3. In one configuration example of the display device of the portable electronic device,
Data line is R (red) G (green) B (blue) each color 17
There is a configuration in which 6 pieces are provided, but in this case, 528 pieces are required for a one-to-one connection, but 2 pieces are required for a connection of two pieces.
It can be reduced to 64.

A TFT that can be formed in the same process as a switching element that drives a liquid crystal is used as the switch section that enables the selection of data line switching.

Here, the above liquid crystal display device in which a plurality of data lines are connected to one output of the data line drive circuit will be described with reference to FIG. FIG. 9 is an equivalent circuit diagram of a liquid crystal display device having the above configuration.

In the figure, reference numeral 100 is a display panel (active matrix type display panel). Although not shown in particular, the liquid crystal panel 100 has a matrix substrate arranged in parallel with each other with a predetermined distance therebetween, a counter substrate, and liquid crystals filled between the two substrates.

On the matrix substrate, a plurality of parallel data lines DL1 to DLN and a plurality of parallel gate lines (scanning lines) GL1 to GLM intersecting the data lines DL.
And are provided. For each gate line GL, from the gate line drive circuit 2, at a timing corresponding to each gate line GL,
A gate signal having a selection voltage and a non-selection voltage is applied,
A data signal (image signal) corresponding to each data line DL is applied to each data line DL from the data line driving circuit 3.

At each intersection of the data line DL and the gate line GL, a pixel electrode (not shown) and the pixel electrode are electrically connected to the corresponding data line DL to write a data signal to the pixel electrode. And a pixel TFT 11 for controlling the. The pixel electrode forms a liquid crystal capacitor 10 with a counter electrode 12 which will be described later and is provided on the counter substrate side.
The liquid crystal capacitor 10 constitutes a pixel which is one unit of display. The gate electrode of the pixel TFT 11 is connected to the gate line GL,
The source electrode is connected to the data line DL, and the drain electrode is connected to the pixel electrode.

In such a configuration, the pixel TFT 11 is in the ON state (low resistance state) while the selection voltage is applied to the gate electrode of the pixel TFT 11 from the gate line drive circuit 2 through the gate line GL (writing period). Therefore, the potential of the data signal applied to the data line DL from the data line driving circuit 3 is applied to the pixel electrode, and the potential of the pixel electrode is set to be the same as the potential of the data line DL. On the other hand, the pixel T
While the non-selection voltage is being applied to the gate electrode of the FT 11 from the gate line driving circuit 2 (holding period), the pixel electrode is in the off state (high resistance state). Retained.

A counter electrode 12, which is the other electrode of the liquid crystal capacitor 10, is formed on the counter substrate which is the other substrate constituting the liquid crystal panel 100. The counter electrode 12 is
It is provided on the entire surface of the counter substrate and is configured to be common to all pixels. An appropriate common voltage is applied to the counter electrode 12 from the matrix substrate side via a common terminal (not shown) arranged around the matrix substrate.

The voltage applied to the liquid crystal capacitor 10 is a voltage corresponding to the potential difference between the pixel electrode and the counter electrode. By controlling this voltage, the light transmittance of the liquid crystal is controlled to display an image. Is possible. The configuration so far is the most basic configuration of the active matrix type liquid crystal display device.

A point to be noted in the liquid crystal panel 100 is that when the plurality of data lines DL formed on the matrix substrate and the data line driving circuit 3 that drives these are connected, each data line DL is individually connected. A plurality of TFTs are integrated into one set via a data line selection TFT (switching element) 13 that constitutes a switch section, and each output signal line D of the data line drive circuit 3 is integrated in a single state. Is connected to. In addition, a portion in which the plurality of data lines DL are connected through the switch unit and integrated into one is referred to as an input signal line.

In this figure, two data lines DL are bundled in a set. More specifically, in the output signal line D1 of the data line driving circuit 3, the data line DL1 and the data line DL2 forming the first set are connected to the data line selection TFTs 13-1a and 13-1.
-1b is connected. Also, the output signal line D2
In addition, the data line DL3 and the data line DL4 forming the second set are connected via the data line selection TFTs 13-2a and 13-2b. Similarly, in the figure, N
= 10, five such data line groups of two lines are formed, that is, first to fifth sets.

Then, the above ten data line selection TFTs
Data line selection TFTs 13-1a, 13-2a, 13-3a connected to odd-numbered data lines DL among 13
In system a, the gate electrodes of the two are connected to the gate line Ga, and the gate line G is output from the switch drive circuit 102.
The opening / closing is controlled by the data line selection signal supplied to a. On the other hand, the data line selection TFTs 13-1b, 13-2b, 13-3b ... Connected to the even-numbered data lines DL.
In the system b, the respective gate electrodes are connected to the gate line Gb, and the gate line G
The opening / closing is controlled by the data line selection signal supplied to b. The data line selection signal is also a signal having an ON voltage and an OFF voltage, like the gate signal.

Each data line selection TFT provided between each data line DL and each output signal line D of the data line drive circuit 3.
13 and an input signal line that connects a plurality of data lines DL as a set via the data line selection TFT 13, and the data line DL that is the output destination of the data signal from the data line drive circuit 3 is set in the set. A data line switching circuit 101 for switching is configured. The data line selection TFT 13 forming the data line switching circuit 101 is formed on the matrix substrate forming the liquid crystal panel 100 in the same process as the pixel TFT 11.

FIG. 10 shows a drive signal (vertical synchronizing signal, data signal, data line selection signal applied to gate lines Ga and Gb, gate lines GL1 to GLM) applied to the liquid crystal panel 100 of the liquid crystal display device. Shows the waveform of the gate signal applied to. The pixel TFT used here
Both 11 and the data line selection TFT 13 are turned on by a positive voltage, like the n-channel FET. Also,
M = 8.

As shown in FIG. 10, in this liquid crystal display device, one horizontal period during which the selection voltage is applied to the gate line GL is divided into two phases, and in each phase, the gate line Ga is used. The data line selection signal applied to Gb causes the data line selection circuit 101 to select one of the a line and the b line of the data line switching circuit 101.
FT13 is turned on. As a result, the data line D of each set
Of the L lines, only the data line DL connected to the data line selection TFT 13 of the turned-on system is connected to the data line drive circuit 3
The data signal is applied, and the data signal is written in the pixel electrode connected to the data line DL.

As described above, in the conventional liquid crystal display device, the data line switching circuit 101 is provided on the matrix substrate.
And the data line switching circuit 101 distributes the data signal output from the output signal line D of the data line drive circuit 3 to the plurality of data lines DL connected to the data signal.
The number of output signal lines D of the data line driving circuit 3 is reduced.

In the one-to-one structure in which one data line is connected to one output of the data line drive circuit, the output of the data line drive circuit and the data line are connected with the high definition of the display panel. Since the pitch becomes narrower, the connection reliability is reduced in the configuration in which the data line driving circuit is externally attached. However, according to this, the connection pitch can be widened as the number of connections is reduced, and The reliability can be secured.

Further, as described above, the liquid crystal display device is
While being used as a display device for portable electronic devices, if the periphery of the display area, that is, the frame portion has a large influence on the design design of the product, this shows that the number of outputs of the data line drive circuit is large. The number of data line driving circuits required is reduced, the area occupied by the data line driving circuits in the frame can be reduced, the frame can be laid out easily, and the degree of freedom in product design and design can be increased. Can be increased.

A liquid crystal display device having such a structure is disclosed in, for example, Japanese Patent Application Laid-Open No. 56-92573,
JP-A-61-223791 and JP-A-4-32222
16, JP-A-6-138851, JP-A-8
No. 234237, etc.

[0024]

However, one output of the above-described conventional data line drive circuit 3 is shared by a plurality of data lines DL, and the data line switching circuit 101 outputs a signal from the data line drive circuit 3. In the liquid crystal display device configured to switch the data line DL that is the output destination of, the frame size can be narrowed, the layout property is high, and the number of connections between the data line DL and the data line drive circuit 3 can be reduced. Although it has an advantage, it has a problem in long-term reliability as a display device.

This is due to the switch portion which constitutes the data line switching circuit 101. That is, as mentioned above,
A TFT is used as a switching element that constitutes a switch unit in the data line switching circuit 101 because it can be formed in the same process as the pixel TFT, but compared with the number of times the pixel TFT is driven, the data line selection TFT 13 is The driving frequency is overwhelmingly large.

For example, in FIG. 9, the pixel TFT 11-1 provided between the data line DL1 and the gate line GL1.
And the data line selection TFT 13-1a that enables the application of the data signal to the data line DL1, the pixel TFT 11-1 is turned on once in one vertical period. The line selection TFT 13-1a is turned on once in one horizontal period. If the total number N of gate lines DL is 220 calculated simply, the number of times the data line selection TFT 13 is driven is 2 times the number of times the pixel TFT 11 is driven.
20 times more.

Therefore, a normal size amorphous TF is used.
T (TFT using amorphous silicon for the semiconductor layer of the channel portion) is sufficient as the pixel TFT 11, but when it is used as the data line selection TFT 13 which is driven many times, the data line selection T
The switching characteristics of the FT 13 are deteriorated and the FT 13 does not operate normally, which is a problem in long-term use as a display device.

The long-term reliability of the TFT can be easily ensured by increasing the channel width of the TFT. However, if the channel width is increased, the power consumption increases due to the increased width, and the TFT
Since the size also increases, it is necessary to widen the matrix substrate on which the TFT is provided, and the problem of pulling in an output signal (image signal) due to an increase in parasitic capacitance occurs. Therefore, a method of ensuring long-term reliability by increasing the channel width is not preferable.

The present invention has been made in view of the above problems, and an object thereof is to bundle a plurality of data lines and connect them to one output of a data line drive circuit, thereby increasing the number of outputs of the data line drive circuit. An active matrix type display device, an active matrix type front panel, a data line switching circuit for the active matrix type display device, and a switch part driving circuit for the data line switching circuit, which can ensure long-term reliability of the active matrix type display device having a reduced configuration. To propose a drive control circuit.

[0030]

In order to solve the above-mentioned problems, the data line switching circuit of the active matrix type display panel of the present invention is formed with a scanning line and a plurality of data lines intersecting with the scanning line. And an input signal which is provided in the active matrix type display panel and which is arranged on the signal input side of the data line for each data line and a plurality of data lines are connected as one set via the switch unit. And a data line switching circuit for selectively inputting the data signal input from the input signal line to a plurality of data lines forming a set by inputting the switch section selectively to the switch section. It is characterized in that the switch section is composed of a plurality of switching elements connected in parallel with each other.

According to this, since the switch section is composed of a plurality of switching elements (hereinafter, may be simply referred to as elements) connected in parallel with each other, one of the elements forming the switch section. By driving, the data signal input from the input signal line can be output to the data line to which the switch section is connected.

Therefore, by appropriately driving a plurality of elements forming the switch section, it is possible to improve long-term reliability and obtain long-term reliability as compared with the conventional switch section constituted by one element. be able to.

In the structure for forming the switch part by increasing the long-term reliability by forming a plurality of such elements, the switch part is formed by only one element and increasing the element size to improve the long-term reliability. Compared with the above, since the occupied area of one switch part can be reduced when the same long-term reliability can be obtained, without hindering the narrowing of the frame or the downsizing of the active matrix display panel,
It can improve long-term reliability.

Further, in the above-described data line switching circuit of the present invention, the plurality of switching elements forming the switch section are provided so that they can be driven independently of each other, and the switch section is selected and driven. It can be configured to be selected and driven.

As a plurality of elements connected in parallel to each other, a configuration in which all of the plurality of elements are simultaneously driven can be considered. In this case, all of the plurality of elements are driven at the same time, and if one of them is out of order, the remaining element outputs a signal to the data line to which the switch section is connected. However, in this case, since a plurality of elements are driven, the power required to drive the switch section becomes large.

In the above-mentioned configuration of the present invention, the plurality of elements forming the switch section are provided so as to be driven independently of each other, and a plurality of elements forming the switch section are provided during a period in which the switch section is selected and driven. Since only one or some of the elements in (1) are selected and driven, compared to the configuration in which all the elements that constitute the switch are driven during the period when the switch is selected and driven. The electric power required to drive the switch unit can be reduced.

That is, the switch section is composed of a plurality of elements connected in parallel with each other, and a plurality of elements are appropriately driven to form a single element without increasing the occupied area of the switch section. The long-term reliability of the switch part can be improved and the power consumption can be suppressed.

Further, in the above-mentioned data line switching circuit of the present invention, the plurality of switching elements forming the switch section are further driven so that the number of times of driving between the respective switching elements is uniform. You can

When a plurality of elements forming the switch section are selected and driven, if a certain specific element among the plurality of elements is driven with priority, the frequency of use of the element varies, and the specific element is driven. May fail sooner than other elements.

In the above configuration of the present invention, when the plurality of elements forming the switch section are selected and driven, the elements are driven so that the number of times of driving each element is the same. It is possible to use the elements evenly and make the life of each element uniform, thereby effectively extending the long-term reliability.

In other words, the switch section is composed of a plurality of elements connected in parallel with each other, and a plurality of elements are appropriately driven to form a single element without expanding the area occupied by the switch section. The long-term reliability can be improved more than that of the switch part, the power consumption can be suppressed, and the long-term reliability can be further improved by using the plurality of elements most effectively.

Further, in the above-described data line switching circuit of the present invention, in each switch portion of the plurality of data lines forming the set, the number of the data lines forming the set is X, and the selection voltage is applied to the scanning line. If one horizontal period is H, H /
It is driven in the X cycle.

As described above, each switch unit of a plurality of data lines forming a set is sequentially operated one by one at an H / X cycle which is a period obtained by dividing one horizontal period H by the number X of bundled data lines. By driving, the data signals corresponding to the respective data lines can be distributed and input to the data lines forming the group during the period in which the selection voltage is applied to the scanning lines and the scanning lines are turned on, so that an image can be displayed.

In order to solve the above-mentioned problems, the switch section drive circuit of the data line switching circuit of the present invention is based on a drive signal from the drive control circuit and is used in the data line switching circuit of the active matrix type display panel. A switch unit drive circuit that selectively drives the switch unit and distributes and inputs the data signal input from the input signal line to a plurality of data lines forming a set. The switch unit is selected and driven. It is characterized in that a plurality of switching elements forming the switch section are selected and driven for a predetermined period.

By controlling the drive of the switch section in the data line switching circuit by such a switch section driving circuit, as already described as the data line switching circuit,
The switch unit is composed of a plurality of elements connected in parallel with each other, and a plurality of elements are appropriately driven to form a single element without increasing the area occupied by the switch unit and without increasing power consumption. The long-term reliability can be improved as compared with the conventional switch section.

Further, in the above-mentioned switch section drive circuit of the data line switching circuit of the present invention, a plurality of switching elements forming the switch section are driven so that the number of times of driving is equalized among the switching elements. can do.

According to this, when the plurality of elements forming the switch section are selected and driven, the elements are driven so that the number of times of driving of each element is the same, so that the plurality of elements forming the switch section are equalized. To ensure the life of each element is
Long-term reliability can be extended more effectively.

Further, in the above-mentioned switch section drive circuit of the data line switching circuit of the present invention, when the number of data lines forming a set is X and one horizontal period in which the selection voltage is applied to the scanning line is H, the drive is performed. Based on the drive signal from the control circuit, each of the switch units of the plurality of data lines forming a set is driven one by one at a cycle of H / X.

By controlling the driving of the switch portion in the data line switching circuit by such a switch portion driving circuit, as already described as the data line switching circuit,
While the selection voltage is being applied to the scanning lines and is on, data signals corresponding to the respective data lines can be distributed and input to the data lines forming a set, and an image can be displayed.

The drive control circuit of the data line switching circuit of the present invention is a drive control circuit which outputs the drive signal of the data line switching circuit to the switch section drive circuit, and the period in which the switch section is selected and driven. It is characterized in that a plurality of switching elements forming the switch section are selected and driven.

By controlling the drive of the switch section in the data line switching circuit by such a drive control circuit, as described above as the data line switching circuit, the switch sections are connected in parallel with each other. Element configuration,
Properly driving a plurality of elements to increase the long-term reliability of the conventional switch section composed of one element without increasing the occupied area of the switch section and without increasing the power consumption. You can

Further, in the drive control circuit of the data line switching circuit of the present invention described above, the plurality of switching elements constituting the switch section are driven so that the number of times of driving is equalized among the switching elements. be able to.

According to this, when the plurality of elements forming the switch section are selected and driven, they are driven so that the number of times of driving of each element is equalized, so that the plurality of elements forming the switch section are evenly distributed. To ensure the life of each element is
Long-term reliability can be extended more effectively.

In the drive control circuit of the data line switching circuit of the present invention described above, drive control is performed, where X is the number of data lines forming a set and H is one horizontal period during which the selection voltage is applied to the scanning lines. Based on the drive signal from the circuit, the switch parts of the plurality of data lines forming a set are sequentially set to H /
It is driven in the X cycle.

In such a drive control circuit, the drive of the switch portion in the data line switching circuit is controlled via the switch portion drive circuit, so that the scanning line is selected as already described as the data line switching circuit. While the voltage is applied and turned on, data signals corresponding to the respective data lines can be distributed and input to the data lines forming the set, and an image can be displayed.

In order to solve the above problems, an active matrix type display panel of the present invention is an active matrix type display panel in which a scanning line and a plurality of data lines intersecting with the scanning line are formed. In the panel, there are provided a switch portion arranged for each data line on the signal input side of the data line and an input signal line connecting a plurality of data lines as a set via the switch portion, and the switch portion is provided. In the active matrix type display panel provided with a data line switching circuit for selectively inputting the data signal input from the input signal line to the plurality of data lines forming a group by being driven selectively, It is characterized in that the switch section is composed of a plurality of switching elements connected in parallel with each other.

By using such an active matrix type display panel, as described above in the data line switching circuit, the switch section is made up of a plurality of elements connected in parallel to each other, and a plurality of elements are appropriately driven. 1
The long-term reliability can be improved as compared with the conventional switch section composed of one element.

Further, in the above-mentioned active matrix type display panel of the present invention, the plurality of switching elements forming the switch section are provided so that they can be driven independently of each other, and the switch section is selected and driven. A plurality of switching elements can be selected and driven for a period.

By using such an active matrix type display panel, as described in the data line switching circuit, the switch section has a plurality of element structures connected in parallel with each other, and a plurality of elements are appropriately driven. As a result, the long-term reliability of the switch section can be improved as compared with the conventional switch section composed of one element without increasing the occupied area of the switch section and without increasing the power consumption.

In order to solve the above problems, the active matrix type display device of the present invention outputs the data signal corresponding to each data line to the above active matrix type display panel and the plurality of data lines. And a scanning line driving circuit that outputs a gate signal having a selection voltage and a non-selection voltage to the scanning line at a timing corresponding to the scanning line.

In order to solve the above problems, the active matrix type display device of the present invention outputs the data signal corresponding to each data line to the above active matrix type display panel and the plurality of data lines. Data line driving circuit, a scanning line driving circuit that outputs a gate signal having a selection voltage and a non-selection voltage to the scanning line at a timing according to the scanning line, and a data line switching circuit in the active matrix display panel. , A drive control circuit that outputs a drive signal for selecting and driving the plurality of switching elements that configure the switch unit during a period in which the switch unit is selected and driven, and a drive signal from the drive control circuit. It is characterized by including a switch section drive circuit for driving a plurality of switching elements of the data line switching circuit.

By using such an active matrix type display device, as described above in the data line switching circuit, the switch portion has a plurality of element configurations connected in parallel with each other, and a plurality of elements are appropriately driven. As a result, the long-term reliability of the switch section can be improved as compared with the conventional switch section composed of one element without increasing the occupied area of the switch section and without increasing the power consumption.

Further, in the above-mentioned active matrix type display device of the present invention, the switch section drive circuit may be mounted in the scanning line drive circuit.

Since the number of circuit members can be reduced by mounting the switch portion drive circuit on the scanning line drive circuit, the cost is reduced accordingly and the area occupied by the circuit member shown in the frame portion is reduced. This will facilitate the design and increase the degree of freedom in design, and further reduce the frame size.

Further, in the above-mentioned active matrix type display device of the present invention, at least one of the data line driving circuit, the scanning line driving circuit, and the switch section driving circuit is provided in the panel. Can be

Data line driving circuit, scanning line driving circuit,
Alternatively, by arranging at least one of the switch section drive circuits in the panel, the area occupied by the frame portion is reduced as compared with the case where these are externally attached, and thus the layout is performed. This will facilitate the design and increase the degree of freedom in design, and further reduce the frame size.

Further, in the above-mentioned active matrix type display device of the present invention, when the number of data lines forming a set is X and one horizontal period in which a selection voltage is applied to the scanning line is H, a plurality of sets forming a set are formed. Each switch of the data line of is 1
They are driven one after another in a cycle of H / X.

As a result, as already described as the data line switching circuit, the data signals corresponding to the respective data lines forming the set are distributed and input during the period in which the selection voltage is applied to the scanning lines and the scanning lines are turned on. And the image can be displayed.

The active matrix type display device of the present invention described above is preferably used as a display device for portable electronic equipment since it has a high layout property and a narrow frame can be achieved.

[0070]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is an active matrix type display device having a structure in which a plurality of data lines are bundled and connected to one output of a data line drive circuit to reduce the number of outputs of the data line drive circuit. In particular, in this configuration, the switch section provided for each data line in the data line switching circuit is formed of a plurality of switching elements, thereby ensuring long-term reliability of the switch section. As a result, the long-term reliability of the liquid crystal display device can be improved.

In the embodiments described below, an active matrix type liquid crystal display device using liquid crystal as an active matrix type display device is exemplified.
The present invention is not limited to liquid crystals at all, and other than liquid crystals as long as it is driven by active matrix and has a memory property capable of holding a data signal once written to a pixel or a bus line. It is also applicable to.

One embodiment according to the present invention will be described with reference to FIGS.
The explanation is based on the following.

FIG. 1 is an equivalent circuit diagram showing the structure of the active matrix type liquid crystal display device of this embodiment.
The same components as those of the conventional example shown in FIG. 9 are designated by the same reference numerals.

That is, in FIG. 1, reference numeral 1 denotes a display panel (active matrix type display panel), and although not shown in particular, the liquid crystal panel 1 is a matrix substrate arranged in parallel to each other with a predetermined distance. And a counter substrate and liquid crystal filled between the both substrates.

On the matrix substrate, a plurality of parallel data lines DL1 to DLN and a plurality of parallel gate lines (scanning lines) GL1 to GLM intersecting the data lines DL.
And are provided. For each gate line GL, from the gate line drive circuit 2, at a timing corresponding to each gate line GL,
A gate signal having a selection voltage and a non-selection voltage is applied,
A data signal (image signal) corresponding to each data line DL is applied to each data line DL from the data line driving circuit 3.

At each intersection of the data line DL and the gate line GL, a pixel electrode (not shown) and the pixel electrode are electrically connected to the corresponding data line DL so that a data signal to the pixel electrode is supplied. A pixel TFT 11 for controlling writing is provided. The pixel electrode forms a liquid crystal capacitor 10 with a counter electrode 12 provided on a counter substrate described later,
The liquid crystal capacitor 10 constitutes a pixel which is one unit of display. The pixel TFT 11 has a gate electrode connected to the gate line GL, a source electrode connected to the data line DL, and a drain electrode connected to the pixel electrode.

In such a configuration, the pixel TFT 11 is in the ON state (low resistance state) while the selection voltage is applied to the gate electrode of the pixel TFT 11 via the gate line GL from the gate line driving circuit 2 (writing period). Therefore, the potential (also referred to as voltage) of the data signal applied to the data line DL from the data line driving circuit 3 is applied to the pixel electrode,
The potential of the pixel electrode is set to be the same as the potential of the data line DL. On the other hand, since the gate electrode of the pixel TFT 11 is in the off state (high resistance state) while the non-selection voltage is applied from the gate line driving circuit 2 (holding period), the potential of the pixel electrode is applied during writing. Held at a fixed potential.

On the counter substrate which is the other substrate constituting the liquid crystal panel 1, the counter electrode 12 which is the other electrode of the liquid crystal capacitor 10 is formed. The counter electrode 12 is provided on the entire surface of the counter substrate and is configured to be common to all pixels.
An appropriate common voltage is applied to the counter electrode 12 from the matrix substrate side via a common terminal (not shown) arranged around the matrix substrate.

The voltage applied to the liquid crystal capacitor 10 is a voltage corresponding to the potential difference between the pixel electrode and the counter electrode. By controlling this voltage, the light transmittance of the liquid crystal is controlled to display an image. Is possible.

Also in the liquid crystal panel 1, as in the liquid crystal panel 100 of FIG. 9, a plurality of data lines DL, here, two data lines DL are bundled into a single line.
The one set is connected to one output signal line D of the data line drive circuit 3. The configuration so far is the same as that of the liquid crystal panel 1 shown in FIG.
Same as 00.

The difference between the liquid crystal panel 1 and the liquid crystal panel 100 lies in the data line switching circuit 4 which switches the data line DL, which is the output destination of the signal from the data line driving circuit 3, between the data lines DL forming the set.

In the conventional data line switching circuit 101 in the liquid crystal panel 100, the switch portion provided for each data line DL is composed of one data line selection TFT 13 (see FIG. 9). On the other hand, as shown in FIG. 1, the liquid crystal panel 1 in the liquid crystal display device of the present embodiment
In the data line switching circuit 4, the switch section provided for each data line DL is composed of a plurality of data line selection TFTs 13 connected in parallel with each other. Here, it is composed of two data line selection TFTs 13 which are connected in parallel and can be driven independently of each other.

More specifically, the output signal line D1 of the data line driving circuit 3 includes the data line DL1 forming the first group.
And the data line DL2 are connected to each other, the data line D
L1 is two data line selection TFTs 13-in parallel with each other.
Data line DL connected via 1aα · 13-1aβ
2 is two data line selection TFTs 13-1b parallel to each other
It is connected via α · 13-1bβ.

Further, in the case where the data line DL3 and the data line DL4 forming the second set are connected to the output signal line D2, the data line DL2 includes two data line selection TFTs 13-2a.alpha..multidot.13-. 2aβ, and the data line DL4 is connected via two data line selection TFTs 13-2bα and 13-2bβ which are parallel to each other.

Similarly, in the figure, N = 10
Therefore, a total of 20 data line selections T are required for forming one set of two data line groups from the first to fifth sets.
The FT 13 is provided. Incidentally, also in this case, the data line selection TFT 13 forming the data line switching circuit 4
Is a pixel T on the matrix substrate that constitutes the liquid crystal panel 1.
It is built in the same process as FT11.

These 20 constituting the data line switching circuit 4
Of the data line selection TFTs 13, data line selection TFTs 13-1aα, 13-1aβ, 13-2aα ・ 1 connected to odd-numbered data lines DL1, DL3, ... DL9.
10 of 3-2aβ, ..., 13-5aα, 13-5aβ are lines a.

Then, of these 10 data line selection TFTs belonging to the a system, the data line selection T marked with α is added.
5 of FT13-1aα, 13-2aα, ... 13-5aα
One is the a (α) system, the gate electrodes of which are connected to the gate line Gaα, and the opening / closing is controlled by the data line selection signal supplied to the gate line Gaα from the switch driving circuit 5.

Further, the data line selection TFT 1 marked with β
Five of 3-1aβ, 13-2aβ, ... 13-5aβ,
In the a (β) system, the mutual gate electrodes are the gate lines G
The opening / closing is controlled by a data line selection signal which is connected to aβ and is supplied from the switch driving circuit 5 to the gate line Gaβ.

Similarly, the even-numbered data lines DL2, DL
4, ... Data line selection TFT 13-connected to DL10
1bα · 13-1bβ, 13-2bα · 13-2bβ,
10 pieces of 13-5bα and 13-5bβ are the b system.

Then, among these 10 data line selection TFTs belonging to the b system, the data line selection T marked with α is added.
5 of FT13-1bα, 13-2bα, ... 13-5bα
One is the b (α) system, the gate electrodes of which are connected to the gate line Gbα, and the opening / closing is controlled by the data line selection signal supplied to the gate line Gaα from the switch driving circuit 5.

Further, the data line selection TFT 1 marked with β
Five of 3-1bβ, 13-2bβ, ... 13-5bβ,
In the b (β) system, the mutual gate electrodes are the gate lines G
It is connected to bβ and its opening / closing is controlled by a data line selection signal supplied from the switch driving circuit 5 to the gate line Gbβ.

FIG. 2 shows the configuration of the switch portion drive circuit 5 which outputs the data line selection signal to the gate lines Gaα to Gbβ.

The switch drive circuit 5 has four level shifters.
It is composed of lid circuits 5a to 5d. Each level shifter circuit 5a
Switch signals from the drive control circuit 6 to 5d, respectively.
SW1 to SW4 are input. Input switch signal
SW1 to SW4 are the first of the level shifter circuits 5a to 5d.
Data line selection TF applied to the input terminal IN01 of 1
Select voltage V that is a voltage for turning on T13_DSH,Also
Is the data line selection applied to the second input terminal IN02
Non-selection voltage V which is a voltage for turning off the TFT 13 _DSLTo
Level converted. The converted output is the level shifter times.
From each output terminal OUT of the paths 5a to 5d, each output terminal OU
Data lines are selected for the gate lines Gaα to Gbβ connected to T.
It is output as a selection signal.

That is, the switch signal SW1 is input to the level shifter circuit 5a, whereby a data line selection signal which is a drive signal for controlling the data line selection TFT 13 of the a (α) system is formed, and is output from the output terminal OUT. Is output. Similarly, the switch signal SW2 is input to the level shifter circuit circuit 5b, whereby a data line selection signal which is a drive signal for the data line selection TFT 13 of the a (β) system is formed and output from the output terminal OUT. . The same applies hereinafter.

As described above, the two data lines DL connected to the same output signal line D are not simultaneously driven, and the period (one horizontal period) in which the selection voltage is applied to the gate line GL is set. It is divided into two phases, and in each phase, of the a system or the b system of the data line switching circuit 4,
One of the data line selection TFTs 13 is turned on.
In this case, the a-system data line selection TFT 13 is
Two a (α) systems and two a (β) systems are provided, and two b system data line selection TFTs 13 are provided for each b (α) system and b (β) system. It has a different structure. Therefore, either the a (α) system or the a (β) system is selected in the phase in which the a system is selected, and similarly, the b (α) system or b in the phase in which the b system is selected. Either of the (β) systems will be selected.

FIG. 3 shows a liquid crystal panel 1 of the above liquid crystal display device.
Drive signals (vertical synchronization signals, data signals, data line selection signals applied to the gate lines Gaα to Gbβ,
The waveforms of the gate signals applied to the gate lines GL1 to GLM) are shown. The pixel TFT 11 used here
The data line selection TFT 13 is an n-channel FE.
As with T, it is supposed to turn on at a positive voltage. Also, M =
It was set to 8.

As shown in FIG. 3, in this liquid crystal display device, when the selection voltage is applied to the first gate line GL1, the selection period (corresponding to one horizontal period) which is the application period of the selection voltage is set. The data line selection signal applied to the gate line Gaα in the first phase turns on the data line selection TFT 13 of the a (α) system of the data line switching circuit 4, and in the next phase, the gate line is divided into two phases. Gb
The data line selection signal applied to α turns on the data line selection TFT 13 of the b (α) system of the data line switching circuit 4.

Then, when the selection voltage is applied to the second gate line GL2 that follows, the a (β) system of the data line switching circuit 4 is generated by the data line selection signal applied to the gate line Gaβ in the first phase. The data line selection TFT 13 is turned on, and in the next phase, a data line selection signal applied to the gate line Gbβ causes b of the data line switching circuit 4 to be turned on.
The data line selection TFT 13 of the (β) system is turned on.

This is repeated after the third gate line GL3, that is, in the third gate line GL3, the data line selection TFT 13 of the a (α) system is turned on in the first phase like the gate line GL1. And in the next phase b
The data line selection TFT 13 of the (α) system is turned on, and in the fourth gate line GL4, the data line selection TFT 13 of the a (β) system is turned on in the first phase and b in the next phase, like the gate line GL2. (Β) System data line selection T
FT13 is turned on.

As described above, two data line selection TFTs 13 of the switch portion provided between the output signal line D of the data line drive circuit 3 and each data line DL are provided in parallel with each other, whereby data line selection is performed. The number of times the TFT 13 is driven can be reduced to 1/2 of that in the configuration in which one data line selection TFT 13 is provided for each data line DL.

As a result, in the configuration in which the number of output signal lines D of the data line driving circuit 3 is reduced and the data line driving circuit 3 is downsized, the data line selecting TFT 13 is not increased in size and The long-term reliability of the line selection TFT 13 can be ensured, and thus the long-term reliability of the liquid crystal display device can be obtained.

In FIG. 3, two αs are provided.
The driving of the data line selection TFTs 13 of β and β is alternately performed every horizontal period, but the present invention is not limited to this.
By dividing the number of times of driving required for the two data line selection TFTs 13 and reducing the number of times of driving at each data line selection TFT 13, long-term reliability can be ensured. The order of driving the two data line selection TFTs 13 is It doesn't matter.

In the description of the present embodiment, two data lines DL2 are set as one set, and the number of data line selection TFTs 13 connected to one data line DL is two.
By bundling the data lines DL as one set of X lines (here, X = 2), the number of output signal lines D of the data line drive circuit 3 is reduced to 1 / X as compared with the case of one-to-one connection. You can
In addition, Y data line selection TFTs 13 connected to one data line DL and having a parallel relationship with each other (here, Y
= 2) By providing the data line selection TFT 13
Can be reduced to 1 / Y of the case where only one data line selection TFT 13 is provided for each data line DL.

In FIGS. 4 and 5, as a modification, the number X of the data lines DL to be integrated is 2, and the number Y of the plurality of data line selection TFTs 13 connected to one data line DL is 3. And the data line switching circuit 8 and X is 3 and Y
2 shows a data line switching circuit 9 in the case where 2 is set. In addition,
4 and 5, for convenience, only the data line DL driven by the output signal line D1 in the data line driving circuit 3 is shown.

In the data line switching circuit 8 of FIG. 4, one of the two data lines DL1 and DL2 connected to the output signal line D1 of the data line driving circuit 3 constitutes the switch portion of the data line DL1. Data line selection TFT 13-1a
The data line selection TFTs 13-1bα · 13-1bβ · 13-1bγ are provided as α · 13-1aβ · 13-1aγ, and constitute the switch unit of the data line DL2.

In the data line switching circuit 9 shown in FIG. 5, the data line DL among the three data lines DL1, DL2, DL3 connected to the output signal line D1 of the data line driving circuit 3 is used.
The data line selection T
FT13-1aα · 13-1aβ is provided, and the data line selection TFTs 13-1bα · 13-1bβ are provided as the switch part of the data line DL2 and the switch part of the data line DL3 is provided. Line selection TFTs 13-1cα and 13-1cβ are provided.

The switch section drive circuit 5'for driving the data line selection TFTs 13 of the data line switching circuits 8 and 9 can be realized by the same structure. That is, as shown in FIG. 6, the four level shifter circuits 5a to 5a shown in FIG.
In addition to the configuration including 5d, two level shifter circuits 5e and 5f are added to make a total of six level shifter circuits 5a.
It may be composed of ~ 5f. The switch signals SW5 and SW6 are further input from the drive control circuit 6 for drive control of the two added level shifter circuits 5e and 5f.

In FIG. 6, the six gate lines Gaα to Gcβ of the data line switching circuit 9 shown in FIG. 5 are shown as the gate lines connected to the output terminals OUT of the level shifter circuits 5a to 5f. , In parentheses, the six gate lines Gaα to Gbγ of the data line switching circuit 8 shown in FIG.
Is shown.

Further, in the present embodiment, the plurality of data line selection TFTs 13 connected to one data line DL and having a parallel relationship with each other are configured to be driven independently of each other, and a plurality of data lines are provided. Although one of the line selection TFTs 13 is selectively driven, the plurality of data line selection TFTs 13 connected in parallel to one data line DL are all driven at the same time within the scope of the present invention. Configuration or 1
A configuration in which some of a plurality of data line selection TFTs 13 that can be independently driven and are connected in parallel to one data line DL are selected and driven is also included.

By the way, in the equivalent circuit diagram of FIG.
The configuration is shown in which the data line driving circuit 3, the gate line driving circuit 2, and the switch driving circuit 5 are provided at the side ends of the two sides of the liquid crystal panel 1 that do not face each other. Of course, such a circuit arrangement may be adopted, but in the liquid crystal display device of the present embodiment, in reality, as shown in FIG. Line drive circuit 3, gate line drive circuit 2, and switch section drive circuit 5
(5 ') is installed.

In FIG. 7, two data line driving circuits 3 are required in the configuration in which one data line DL is connected to one output signal line D of the data line driving circuit 3, and two data line driving circuits 3 are set as one set. It becomes possible to connect the gate line drive circuit 2 to the space for disposing the data line drive circuit 3 which is no longer needed by connecting the gate line drive circuit 2
And a switch portion drive circuit 5 (5 ').

As described above, by mounting the drive circuits such as the data line drive circuit 3 and the gate line drive circuit 2 of the liquid crystal panel 1 together on one side of the liquid crystal panel 1, the outer peripheral portion of the display area 1a is mounted. It is possible to narrow the frame part on three sides except one side, and effectively improve the degree of freedom in product design and design as compared with a configuration in which the two sides of the frame part are wide, and devices such as mobile phones Is more suitable. In the drawing, the member number 7 indicates a control signal such as a clock signal or a start pulse signal, a data signal,
The FPC receives the power supply voltage and the switch signals SW1 to SW4 for controlling the drive of the switch drive circuit 5 (5 ′) described above.

Further, in FIG. 7, the data line drive circuit 3, the gate line drive circuit 2, and the switch unit drive are provided on the matrix substrate side of the pair of substrates forming the liquid crystal panel 1 on which the data lines DL and the like are formed. The configuration provided with the circuit 5 is adopted, and by adopting such a configuration, the liquid crystal panel 1
On the other hand, the mounting space can be made more compact as compared with the configuration in which the drive circuits are externally attached, so that the frame can be further narrowed. It is also effective to provide at least one of the data line drive circuit 3, the gate line drive circuit 2, and the switch unit drive circuit 5 (5 ′).

In the case where the matrix substrate is provided with the data line driving circuit 3, the gate line driving circuit 2, and the switch portion driving circuit 5 (5 '), the so-called driver monolithic structure is directly formed on the matrix substrate by LPS, CG silicon or the like. As a mold, or as in the case of amorphous silicon, each drive circuit is created by LSI, and TAB, C
It may be mounted on the matrix substrate by OG.

Further, the switch drive circuit 5 (5 ') may be mounted on the gate line drive circuit 2. The gate line drive circuit 2 has a level shifter circuit inside in order to drive the gate line GL of the pixel TFT 11. Therefore, the switch portion drive circuit 5 (5 ′) including the level shifter circuit for driving the gate lines Ga to GLd of the data line selection TFT 13 is accompanied by a drastic change in the manufacturing process in the gate line drive circuit 2. Can be incorporated without.

In FIG. 8A, the switch section drive circuit 5
A gate line drive circuit 2'having (5 ') is shown. The gate line drive circuit 2'includes the above-mentioned switch section drive circuit 5 (5 ') in addition to the shift register group 2a, the level shifter group 2b, and the output circuit 2c.

The shift register group 2a is a liquid crystal drive output transfer circuit, which receives a start pulse signal SP.
The 1-bit signal is transferred from the shift register group 2a to each output in the level shifter group 2b according to the clock signal CK. The level shifter group 2b receives the liquid crystal drive output signal transferred from the shift register group 2a,
Pixel TFT input from outside the gate line drive circuit 2 '
11 select voltage V _GLH or non-select voltage V _GLL
This is a block for level conversion into. The output circuit 2c, which is composed of an output buffer, is a circuit that outputs a liquid crystal drive output whose level has been converted in the level shifter group 2b, and outputs a gate signal that drives the gate line GL in the liquid crystal panel 1.

In this way, the switch section drive circuit 5
By using the gate line drive circuit 2 ′ equipped with (5 ′), the number of circuits to be arranged in the frame portion is further reduced, so that the occupied area in the frame portion is further reduced and the frame portion The layout is good, and the frame can be narrowed. In addition, even if the driving circuits such as the gate line driving circuit 2 and the gate line driving circuit 3 are externally attached,
This eliminates the need for the step of connecting the switch unit drive circuit 5 (5 ′) to the liquid crystal panel 1, thus reducing the manufacturing cost.

Further, the switch section drive circuit 5 (5 ') is mounted.
In the case of the mounted gate line drive circuit 2 ', the data line
Selection signal selection voltage V_DSHAnd non-selection voltage V_DSLThe
Selection voltage V of the gate signal supplied to the gate line GL_GLHOver
And non-selection voltage V_GLLIt is possible to have the same configuration as
As shown in FIG. 8A, the data line selection TFT 13 is unique
Of the data line selection signal
_DSHAnd non-selection voltage V_{DS L}Is set. This allows
Selection voltage V of the data line selection TFT 13_DSHThe pixel TF
Select voltage V of T11_GLHCan be lower and drive
To improve the reliability of the data line selection TFT 13 which is frequently used,
It can also be achieved from the viewpoint of lowering the selection voltage.

The pixel TFT 11 has chargeability to the pixel electrode.
High selection voltage V to improve_{GL H}But you need
The data line selection TFT 13 outputs the data line drive circuit 3
The data signal supplied from the signal line D is supplied to the data line DL.
Therefore, the selection voltage V of the pixel TFT 11
_GLHIt can fulfill its function without being set to a high value.
it can. The high and low of the selection voltage mentioned here is an absolute value,
Selection voltage V of the data line selection TFT 13_DSHThe absolute value of
Select voltage V of pixel TFT 11_GLHSmaller than the absolute value of
ing.

Incidentally, here, the data line selection TFT 13
Non-selection voltage V_DSLAlso non-selection of the pixel TFT11
Voltage V_GLLI set it separately from, but this is not always necessary
Yes. That is, the data line selection TFT 13 also has a switch.
In order to improve the etching characteristics, the non-selection voltage V_DSL
Must be sufficiently dropped, and the non-selection voltage V
_DSLIs the non-selection voltage V of the pixel TFT 11._GLLThe same degree as
It is necessary to secure it. Therefore, the game shown in FIG.
The data line selection TFT 13 as in the gate line drive circuit 2 '.
Non-selection voltage V_DSLIs the non-selection voltage V of the pixel TFT 11.
_GLLCan be the same as. This configuration is shown in FIG.
Since the power supply line can be reduced compared to the configuration of (a),
To simplify the wiring layout in the line driving circuit 2 '.
You can Also, since the number of lines is reduced,
No need for external circuit to create source voltage, cost down
It is also possible.

[0122]

As described above, the data line switching circuit of the active matrix type display panel according to the present invention includes:
A switch unit provided in the active matrix display panel in which a plurality of data lines intersecting with the scanning lines are formed, and a switch unit provided for each data line on the signal input side of the data line;
An input signal line for connecting a plurality of data lines as a set via the switch unit, and by selectively driving the switch unit, a data signal input from the input signal line is set. In the data line switching circuit for distributing and inputting to a plurality of data lines that form the switch, the switch section is composed of a plurality of switching elements connected in parallel with each other.

Thus, by appropriately driving a plurality of elements forming the switch section, the long-term reliability can be improved and the long-term reliability can be improved as compared with the conventional switch section composed of one element. Obtainable.

The structure for increasing the long-term reliability of the switch part formed from a plurality of such elements is a structure for increasing the long-term reliability by forming the switch part from only one element and increasing the element size. Compared with the above, since the occupied area of one switch part can be reduced when the same long-term reliability can be obtained, without hindering the narrowing of the frame or the downsizing of the active matrix display panel,
This has the effect of increasing long-term reliability.

Further, in the above-described data line switching circuit of the present invention, the plurality of switching elements forming the switch section are provided so that they can be driven independently of each other, and the switch section is selected and driven. It can be configured to be selected and driven.

Thus, the plurality of elements forming the switch section are provided so that they can be driven independently of each other, and during the period in which the switch section is selected and driven, among the plurality of elements forming the switch section. Since one or several elements are selected and driven, it is necessary to drive the switch section as compared with the configuration in which all the elements that make up the switch section are driven during the period when the switch section is selected and driven. Power consumption can be reduced.

That is, the switch section is composed of a plurality of elements connected in parallel with each other, the plurality of elements are appropriately driven, and the area occupied by the switch section is not widened. This has the effect of increasing the long-term reliability of the switch section and suppressing power consumption.

Further, in the above-mentioned data line switching circuit of the present invention, further, the plurality of switching elements forming the switch section are driven so that the number of times of driving is equalized among the switching elements. You can

As a result, when the plurality of elements forming the switch section are selected and driven, the elements are driven so that the number of times each element is driven is equalized. Therefore, the plurality of elements forming the switch section are used uniformly. Thus, the life of each element can be made uniform, and long-term reliability can be effectively extended.

That is, the switch section is composed of a plurality of elements connected in parallel with each other, and a plurality of elements are appropriately driven to expand the area occupied by the switch section, thereby forming a single element. As a result, the long-term reliability can be improved more than that of the switch section, the power consumption can be suppressed, and the long-term reliability can be further improved by using the plurality of elements most effectively.

Further, in the above-described data line switching circuit of the present invention, in each switch section of the plurality of data lines forming the set, the number of the data lines forming the set is X, and the selection voltage is applied to the scanning line. If one horizontal period is H, H /
It is driven in the X cycle.

As described above, the switch parts of the plurality of data lines forming a set are sequentially arranged one by one in the H / X cycle which is a period obtained by dividing one horizontal period H by the number X of bundled data lines. By driving, it is possible to distribute and input the data signal corresponding to each of the data lines forming the group during the period when the selection voltage is applied to the scanning line and is turned on, and it is possible to display an image. Play.

As described above, the switch portion drive circuit of the data line switching circuit of the present invention selects the switch portion in the data line switching circuit of the active matrix type display panel based on the drive signal from the drive control circuit. A switch unit drive circuit for driving the data signals input from the input signal lines by distributing them to a plurality of data lines forming a set, and a period in which the switch units are selected and driven, It is characterized in that a plurality of switching elements forming the switch section are selected and driven.

By controlling the drive of the switch portion in the data line switching circuit by such a switch portion driving circuit, as already described as the data line switching circuit,
The switch unit is composed of a plurality of elements connected in parallel with each other, and a plurality of elements are appropriately driven to form a single element without increasing the area occupied by the switch unit and without increasing power consumption. The effect is that the long-term reliability can be improved as compared with the conventional switch section.

Further, in the above-mentioned switch section drive circuit of the present invention, it is possible to drive a plurality of switching elements constituting the switch section so that the number of times of driving among the respective switching elements is uniform.

As a result, when the plurality of elements forming the switch section are selected and driven, the elements are driven so that the number of times each element is driven is equalized. Therefore, the plurality of elements forming the switch section are used uniformly. As a result, the life of each element can be made uniform, and long-term reliability can be extended more effectively.

In the switch drive circuit of the present invention described above, if the number of data lines forming a set is X and one horizontal period in which a selection voltage is applied to the scanning lines is H, drive from the drive control circuit is performed. Based on the signal, the switch units of the plurality of data lines forming a set are sequentially driven one by one at an H / X cycle.

By controlling the drive of the switch portion in the data line switching circuit by such a switch portion driving circuit, as already described as the data line switching circuit,
While the selection voltage is being applied to the scanning lines and is on, data signals corresponding to the respective data lines can be distributed and input to the data lines forming a set, and an image can be displayed.

The drive control circuit of the data line switching circuit of the present invention is a drive control circuit for outputting the drive signal of the data line switching circuit to the switch section drive circuit, and is a period in which the switch section is selected and driven. It is characterized in that a plurality of switching elements forming the switch section are selected and driven.

By controlling the driving of the switch section in the data line switching circuit by such a drive control circuit, as described above as the data line switching circuit, the switch sections are connected in parallel with each other. Element configuration,
Properly driving a plurality of elements to increase the long-term reliability of the conventional switch section composed of one element without increasing the occupied area of the switch section and without increasing the power consumption. There is an effect that can be.

Further, in the drive control circuit of the present invention described above, the plurality of switching elements forming the switch section may be driven so that the number of times of driving is equalized among the switching elements.

As a result, when the plurality of elements forming the switch section are selected and driven, the elements are driven so that the number of times each element is driven is equalized. Therefore, the plurality of elements forming the switch section are used uniformly. As a result, the life of each element can be made uniform, and long-term reliability can be extended more effectively.

In the drive control circuit of the present invention described above, when the number of data lines forming a set is X and one horizontal period in which a selection voltage is applied to the scanning lines is H, the drive signal from the drive control circuit is set. Based on the above, each switch unit of the plurality of data lines forming a set is sequentially driven one by one in the cycle of H / X.

In such a drive control circuit, the drive of the switch section in the data line switching circuit is controlled through the switch section drive circuit, so that the scan line is selected as already described as the data line switch circuit. While the voltage is being applied and turned on, it is possible to distribute and input the corresponding data signals to the data lines forming the set, and it is possible to display an image.

As described above, the active matrix type display panel of the present invention is an active matrix type display panel in which the scanning lines and the plurality of data lines intersecting with the scanning lines are formed. The signal input side of the data line is provided with a switch part arranged for each data line and an input signal line connecting a plurality of data lines as a set via the switch part, and the switch part is alternatively. In the active matrix type display panel provided with a data line switching circuit for driving the data signal input from the input signal line to distribute the data signal to a plurality of data lines forming a set and inputting the data line switching circuit, It is characterized by comprising a plurality of switching elements connected in parallel with each other.

By using such an active matrix type display panel, as described above in the data line switching circuit, the switch section is made up of a plurality of elements connected in parallel with each other, and a plurality of elements are appropriately driven. 1
The long-term reliability can be improved as compared with the conventional switch section composed of one element.

Further, in the above-mentioned active matrix type display panel of the present invention, the plurality of switching elements forming the switch section are provided so that they can be driven independently of each other, and the switch section is selected and driven. A plurality of switching elements can be selected and driven for a period.

By using such an active matrix type display panel, as described above in the data line switching circuit, the switch section is made up of a plurality of elements connected in parallel with each other, and a plurality of elements are appropriately driven. Thus, it is possible to improve the long-term reliability of the switch section without increasing the area occupied by the switch section and without increasing the power consumption, as compared with the conventional switch section configured by one element.

As described above, the active matrix type display device of the present invention includes the active matrix type display panel having the above structure and the data line drive for outputting the data signal corresponding to each data line to the plurality of data lines. A circuit and a scanning line driving circuit that outputs a gate signal having a selection voltage and a non-selection voltage to the scanning line at a timing corresponding to the scanning line are provided.

As described above, the active matrix display device of the present invention includes the active matrix display panel having the above-described structure and the data line drive for outputting the data signal corresponding to each data line to the plurality of data lines. A circuit, a scanning line driving circuit that outputs a gate signal having a selection voltage and a non-selection voltage to the scanning line at a timing according to the scanning line, and a switch unit of a data line switching circuit in the active matrix display panel. A drive control circuit that outputs a drive signal for selectively driving the plurality of switching elements that form the switch during a period in which the switch section is selected and driven; and a drive signal from the drive control circuit based on the drive signal. ,
A switch unit drive circuit for driving a plurality of switching elements of the data line switching circuit is provided.

By using such an active matrix type display device, as already described in the data line switching circuit, the switch portion has a plurality of element configurations connected in parallel to each other, and a plurality of elements are appropriately driven. Thus, it is possible to improve the long-term reliability of the switch section without increasing the area occupied by the switch section and without increasing the power consumption, as compared with the conventional switch section configured by one element.

Further, in the above-mentioned active matrix type display device of the present invention, the switch portion drive circuit may be mounted in the scanning line drive circuit.

Since the number of circuit members can be reduced by mounting the switch portion drive circuit on the scanning line drive circuit, the cost is reduced accordingly, and the area occupied by the circuit member shown in the frame portion is reduced. This has the effect of facilitating the design, increasing the degree of freedom in design, and further achieving a narrower frame.

Further, in the above-mentioned active matrix type display device of the present invention, at least one of the data line driving circuit, the scanning line driving circuit and the switch section driving circuit is provided in the panel. Can be

Data line driving circuit, the scanning line driving circuit,
Alternatively, by arranging at least one of the switch section drive circuits in the panel, the area occupied by the frame portion is reduced as compared with the case where these are externally attached, and thus the layout is performed. This has the effect of facilitating the design, increasing the degree of freedom in design, and further achieving a narrower frame.

Further, the above-mentioned active matrix type display device of the present invention is preferably used for a display device of a portable electronic device since it has a high layout property and a narrow frame can be achieved.

[Brief description of drawings]

FIG. 1 is an equivalent circuit diagram showing a configuration of an active matrix type liquid crystal display device according to an embodiment of the present invention, in which two data lines are bundled in a set and two data lines are provided in a switch part. The data line selection circuit is provided with the data line selection TFT.

FIG. 2 is a block diagram showing a schematic configuration of a switch section drive circuit which is provided in the active matrix display device and drives a switch section of a data line switching circuit.

FIG. 3 is a waveform diagram showing various drive signals applied to a liquid crystal panel of the active matrix display device.

FIG. 4 is an explanatory diagram showing a data line switching circuit in which two data lines are bundled as a set and three switch switches for each data line are provided with three data line selection TFTs.

FIG. 5 is an explanatory diagram showing a data line switching circuit in which three data lines are bundled together and two data line selection TFTs are provided in the switch section of each data line.

FIG. 6 is a block diagram showing a schematic configuration of a switch section drive circuit for driving a switch section of the data line switching circuit of FIGS. 4 and 5;

FIG. 7 is a plan view of the active matrix display device, showing an arrangement of drive circuits in a liquid crystal panel.

8A and 8B are block diagrams showing a configuration of a gate line drive circuit having a switch section drive circuit which can be provided in the active matrix display device.

FIG. 9 is an equivalent circuit diagram showing a configuration of a conventional active matrix type display device, in which two data lines are grouped and each data line is bundled through one data line selection TFT.

FIG. 10 is a waveform diagram showing various drive signals applied to the liquid crystal panel of the active matrix display device.

[Explanation of symbols]

1 Liquid Crystal Panel 2 Gate Line Driving Circuit 3 Data Line Driving Circuit 4 Data Line Switching Circuit 5 Switch Section Driving Circuit 5'Switch Section Driving Circuit 6 Drive Control Circuit 7 Input FPC 8 Data Line Switching Circuit 9 Data Line Switching Circuit 10 Liquid Crystal Capacitance 11 Pixel TFT 12 Counter electrode 13 Data line selection TFT (switch section, switching element) D Output signal line DL Data line GL Gate line (scanning line)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI Theme Coat (reference) G09G 3/20 621 G09G 3/20 621M 623 623R 680 680G (72) Inventor Toshifumi Kawaguchi Abeno Osaka, Osaka Prefecture 22-22, Nagaike-cho, Ku-ku, Ltd. F-term within SHARP CO., LTD. AA22 AA31 AA45 AA48 AA56 BA03 BA43 CA19 DA09 DA13 DB01 DB04 EA04 FA01 FB12 FB14 FB15 GA10

Claims (18)

[Claims] 1. A switch provided in an active matrix type display panel in which a scanning line and a plurality of data lines intersecting with the scanning line are formed, and a switch provided for each data line on a signal input side of the data line. Section and an input signal line that connects a plurality of data lines as a set via the switch section, and the switch section is selectively driven, so that the data signal input from the input signal line is provided. In a data line switching circuit for distributing and inputting to a plurality of data lines forming a set, the switch section is composed of a plurality of switching elements connected in parallel to each other, and data of an active matrix type display panel. Line switching circuit. 2. A plurality of switching elements constituting the switch section are provided so that they can be driven independently of each other, and are selected and driven during a period in which the switch section is selected and driven. 2. A data line switching circuit of the active matrix type display panel according to 1. 3. The data of the active matrix type display panel according to claim 2, wherein the plurality of switching elements forming the switch section are driven so that the number of times of driving among the switching elements is uniform. Line switching circuit. 4. Each of the switch units of the plurality of data lines forming a set is sequentially arranged one by one, where X is the number of data lines forming the set and H is one horizontal period during which a selection voltage is applied to the scanning lines. H /
The data line switching circuit of the active matrix type display panel according to claim 1, wherein the data line switching circuit is driven in a cycle of X. 5. 5. The switch section in the data line switching circuit of the active matrix type display panel according to claim 2, is selectively driven based on a drive signal from the drive control circuit to input from the input signal line. A switch unit drive circuit that distributes and inputs the generated data signal to a plurality of data lines forming a set, and selects a plurality of switching elements that constitute the switch unit during a period in which the switch unit is selected and driven. A drive circuit for a switch section of a data line switching circuit, characterized in that the drive section is driven by a switch. 6. The switch section driving circuit of a data line switching circuit according to claim 5, wherein a plurality of switching elements forming the switch section are driven so that the number of times of driving between the switching elements is uniform. circuit. 7. When a number of data lines forming a set is X and a horizontal period in which a selection voltage is applied to a scanning line is H, a plurality of groups forming a set are generated based on a drive signal from a drive control circuit. 7. The switch unit drive circuit of the data line switching circuit according to claim 5, wherein each switch unit of the data line is sequentially driven one by one at an H / X cycle. 8. A drive control circuit for outputting a drive signal to a switch section drive circuit of a data line switching circuit according to claim 5, wherein a plurality of switch control sections constitute a switch section during a period in which the switch section is selected and driven. A drive control circuit for a data line switching circuit, characterized in that the switching element is selected and driven. 9. A drive control circuit for a data line switching circuit according to claim 8, wherein a plurality of switching elements forming the switch section are driven so that the number of times of driving between the switching elements is uniform. . 10. When X is the number of data lines forming a set and H is one horizontal period during which a selection voltage is applied to the scanning lines, each switch unit of the plurality of data lines forming the set is sequentially arranged one by one. H
The drive control circuit of the data line switching circuit according to claim 8 or 9, wherein the drive control circuit is driven in a cycle of / X. 11. An active matrix type display panel having a scan line and a plurality of data lines intersecting with the scan line, wherein each data line is arranged on the signal input side of the data line in the panel. By providing an input signal line that connects a plurality of data lines as a set via the provided switch unit and the switch unit, and by selectively driving the switch unit,
In an active matrix type display panel provided with a data line switching circuit for distributing and inputting a data signal input from an input signal line to a plurality of data lines forming a set, the switch parts are connected in parallel with each other. An active matrix type display panel comprising a plurality of switching elements. 12. A plurality of switching elements constituting the switch section are provided so that they can be driven independently of each other, and a plurality of switching elements are selected and driven during a period in which the switch section is selected and driven. The active matrix type display panel according to claim 11, which is characterized in that. 13. An active matrix type display panel according to claim 11, a data line drive circuit for outputting a data signal according to each data line to the plurality of data lines, and a scanning line to the scanning line. An active matrix type display device, comprising: a scanning line driving circuit that outputs a gate signal having a selection voltage and a non-selection voltage at a timing according to the above. 14. An active matrix type display panel according to claim 12, a data line drive circuit for outputting a data signal corresponding to each data line to the plurality of data lines, and the scanning line to the scanning line. The switching unit includes a scanning line driving circuit that outputs a gate signal having a selection voltage and a non-selection voltage at different timings, and a plurality of switching elements that configure the switching unit of the data line switching circuit in the active matrix display panel. A drive control circuit that outputs a drive signal for selecting and driving during a selected and driven period, and drives a plurality of switching elements of the data line switching circuit based on the drive signal from the drive control circuit An active matrix type display device comprising: 15. The switch section drive circuit is mounted in the scanning line drive circuit.
The active matrix type display device described in 1. 16. At least one of the data line drive circuit, the scanning line drive circuit, and the switch unit drive circuit.
The active matrix display device according to claim 1, wherein the active matrix display device is provided in a panel. 17. A switch unit for a plurality of data lines forming a set, wherein each switch section has a set of X data lines and H is a horizontal period during which a selection voltage is applied to a scanning line. H
14. The driving is performed at a cycle of / X.
17. The active matrix display device according to any one of 16. 18. The active matrix type display device according to claim 13, which is a display device of a portable electronic device.